forsymcom's modelalt/media/protection-relays/product-manuals/... · manual/automatic switch....
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PUMP#1
PUMP#2
MAGNETICCONTACTOR
#1
MAGNETICCONTACTOR
#2
L1 L2
BE SURE POWER IS DISCONNECTED PRIOR TO INSTALLATION!!FOLLOW NATIONAL, STATE AND LOCAL CODES!
The Model ALT alternating relay is used toalternate between two loads. It is commonlyused in duplex pumping applications tobalance the runtime of both pumps. Thevoltage must be specified in the ALT partnumber—Table 1 identifies all availableModel ALTs.
TABLE 1: ALT Model NumbersMODEL ALT-S
The Model ALT-S has a single-pole, double-throw output relay and is used insingle high-level float applications. When the float switch opens, the alternatingrelay changes state forcing the other pump to run the next time the float closes.
CONNECTIONS (MODEL ALT-S)1. Mount the Model OT08 octal socket in a convenient location inside the pump control panel.2. Connect one of the pump's magnetic contactor coils (#1) between socket terminal 2 and L1 of the
power supply (see Figure 1).3. Connect the other pump's magnetic contactor coil (#2) between socket terminal 8 and L1.4. Connect the power supply L1 to socket terminal 3 and L2 to terminal 4.5. Connect socket terminals 1 and 5 to one side of the pilot device (pressure switch, float switch or other isolated contact).6. Connect the unconnected side of the pilot device to L2.7. Plug the Model ALT into the socket.
FIGURE 1: Typical Wiring Diagram for the Model ALT-S
ALT-24-S 20–26VAC, SPDT relayALT-24-X 20–26VAC, DPDT relayALT-24-S-SW 20–26VAC, SPDT relay w/ manual/automatic switchALT-24-X-SW 20–26VAC, DPDT relay, w/ manual/automatic switchALT-115-S 95–125VAC, SPDT relayALT-115-X 95–125VAC, DPDT relayALT-115-S-SW 95–125VAC, SPDT relay, w/ manual/automatic switchALT-115-X-SW 95–125VAC, DPDT relay, w/ manual/automatic switchALT-230-S 195-250VAC, SPDT relayALT-230-X 195–250VAC, DPDT relayALT-230-S-SW 195–250VAC, SPDT relay, w/ manual/automatic switchALT-230-X-SW 195–250VAC, DPDT relay, w/ manual/automatic switch
2880 North Plaza Drive, Rapid City, SD 57702(800) 843-8848 · (605) 348-5580
www.symcom.com
INSTALLATION INSTRUCTIONSFOR SYMCOM'SMODEL ALT
1 458
2 3
7 6
SUPPLY
PILOTDEVICE
L2 L1
NC
NOC
1 458
2 3
7 6MAG. COIL
#2
MAG. COIL#1
PRESSURE SWITCH,FLOAT SWITCH OROTHER ISOLATED
CONTACT
LEAD
LAG
S1
F1
F2
F3
L1
L2
L1
L2
L1
L2
F4
F5
F6
S2
12 3
4
567
8
PUMP#1
PUMP#2
MODEL ALT-X
The Model ALT-X has an internal double-pole, double-throw, cross-connectedrelay and is used in dual high-level float applications. The pumps alternate asin the ALT-S version, but the cross-connected relay configuration allows bothpumps to run simultaneously when both the lead and lag floats are closed.
CONNECTIONS (MODEL ALT-X)
1. Mount the Model OT08 octal socket in a convenient location inside the pump control panel.2. The control circuit should be separately fused to avoid disabling the control circuit when one pump is
disconnected for service.3. Connect Pump #1’s magnetic contactor coil between socket terminal 8 and L2 of the power supply.4. Connect Pump #2’s magnetic contactor coil between socket terminal 7 and L2 of the power supply.5. Connect the LEAD pilot device, S1 (pressure switch, float switch or other isolated contact), between
socket terminals 1 and 3. Each time S1 opens, the relay changes state forcing the other pump to runthe next time the float closes.
6. Connect the LAG pilot device, S2, between socket terminals 2 and 3.7. Connect L2 of the power supply to socket terminal 6 and L1 to terminal 3.8. Plug the Model ALT into the socket.
FIGURE 2: Typical Wiring Diagram for the Model ALT-X
MANUAL/AUTOMATIC SWITCHThe ALT is also available with a built-in switch (-SW option) that can be used to manually force one pump to run everytime the float closes. This is useful when a pump has been removed for repair or for test purposes. In the case of theModel ALT-X-SW, the switch essentially forces one pump to be the lead pump, while still allowing the second pump torun if both floats are closed.
F1 & F2: 1–2A TYPICAL SIZE
FOR CONTACTOR COILS
MAGNETIC CONTACTORS
F3–F6: SIZE FOR INDIVIDUAL PUMP APPLICATION
1 458
2 3
7 6
SUPPLY
PILOTDEVICE
MODEL ALT-X
OPTIONALPUMPSAVER® PUMP
PROTECTOR
OPTIONALPUMPSAVER® PUMP
PROTECTOR